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This chapter presents a metrological approach for measuring social sustainability aspects in municipalities: the aim is explicitly formulated in support of a much-needed extension of the SI units. The approach builds on rigorous conceptual definitions of the attributes to be measured, includes a focus on usability, and extends the recently developed model “man as measurement instrument”–including the application of probabilistic conjoint measurement theory–into social sustainability metrics in municipalities. In Section 11.2, the collaborative process of defining the constructs to be measured is described. This is followed by Section 11.3, which defines our measurement system and measurement model where the “municipality as measurement instrument” is introduced together with the unique metrological properties obtained. In Section 11.4, a testing procedure for theoretical expectations is presented, and we then further illustrate this approach based on a sustainability aspect–qualityof life–using data from the Swedish open database, Kolada, in Section 11.5. Finally, this chapter concludes with reflections, learning, and proposals for further methodological advancements. We encourage a collaborative process between end-users, social sustainability experts, and metrologists–for developing, testing, evaluating, andrevising fit-for-purpose metrics and, thus, enable more well-informed decisions in developing meaningful and effective policies.